I Have Been On Norethindrone Got 3 Months Now, My

I have been on norethindrone got 3 months now, my periods are normally very regular. I have had unprotected sec during the time I've been taking this bc... I am now late for this month's period (approx. 3 days) With no symptoms of pregnancy... jusThe last few days I unplugged from the chaos of the world and embraced nature to reboot.t a heaviness in my lower ab and slight breast tenderness. Is this normal, or should I follow up w my Dr and get a pregnancy test performed?